Win a game while possessing 2 pieces less than your opponent (Classic Game, not Head to head)

As the trophy description says, you must win a Classic Game while possessing 2 pieces less than your opponent. Practically, the only way to execute this is to Checkmate the opponent sometime early-midgame while having lost more pieces than your opponent. Sacrifice your pawns as necessary and avoid capturing opponent pieces if you can while forcing the opponent King into a dead end.